<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Map集合类型的使用</title>
</head>
<body>
    
</body>
<script>
    let map = new Map([
        ['first name', 'mercer'],
        ['last name', 'jiang']
    ])
    console.log('map:', map)
    console.log(map.delete('first name'))    
    console.log(map)
</script>
</html>